KVM: x86: Fix the NULL pointer parameter in check_cr_write()

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Routine check_cr_write() will trigger emulator_get_cpuid()->
kvm_cpuid() to get maxphyaddr, and NULL is passed as values
for ebx/ecx/edx. This is problematic because kvm_cpuid() will
dereference these pointers.

Fixes: d1cd3ce900 ("KVM: MMU: check guest CR3 reserved bits based on its physical address width.")
Reported-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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Yu Zhang 2017-09-18 18:45:01 +08:00 • committed by Radim Krčmář

parent 95e2a3b3ef

commit d6500149bc

1 changed files with 5 additions and 3 deletions

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arch/x86/kvm/emulate.c

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